/Engine/Source/Runtime/Experimental/ChaosCore/Public/Chaos/Rotation.h
Check that two rotations are approximately equal. Assumes the quaternions are normalized and in the same hemisphere. For small values of Epsilon, this is approximately equivalent to checking that the rotations are within 2*Epsilon radians of each other.
static bool IsNearlyEqual &40; const TRotation< FRealDouble, 3 > & A, const TRotation< FRealDouble, 3 > & B, const FRealDouble Epsilon &41;